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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT ¥ in Thousands, $ in Thousands | CNY (¥) | USD ($) | Class A Ordinary Shares CNY (¥) shares | Class B Ordinary Shares shares | Class C Ordinary Shares CNY (¥) shares | Ordinary Shares CNY (¥) shares | Additional Paid-in Capital CNY (¥) | Additional Paid-in Capital USD ($) | Treasury Stock shares | Accumulated Other Comprehensive (Loss)/Income CNY (¥) | Accumulated Other Comprehensive (Loss)/Income USD ($) | Accumulated Deficit CNY (¥) | Accumulated Deficit USD ($) | Total Sunlands Technology Group Shareholders' Deficit CNY (¥) | Total Sunlands Technology Group Shareholders' Deficit USD ($) | Noncontrolling Interest CNY (¥) | Noncontrolling Interest USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 |  | ¥ (888,955) |  |  |  |  | ¥ 1 | ¥ 30,911 |  |  |  |  | ¥ (919,867) |  | ¥ (888,955) |  |  |
Balances (in shares) at Dec. 31, 2016 | shares |  |  |  |  |  |  | 3,818,618 |  |  |  |  |  |  |  |  |  |  |
Net loss for the year |  | (918,714) |  |  |  |  |  |  |  |  |  |  | (918,578) |  | (918,578) |  | ¥ (136) |
Capital contribution from a noncontrolling shareholder |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 |
Repurchase of equity from shareholders | [1] | (71,303) |  |  |  |  |  | (30,000) |  |  |  |  | (41,303) |  | (71,303) |  |  |
Cash dividend to a Series A convertible redeemable preferred shareholder |  | (43,000) |  |  |  |  |  |  |  |  |  |  | (43,000) |  | (43,000) |  |  |
Shares issuance in relation to share-based compensation, shares | shares |  |  |  |  |  |  | 510,382 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  | 288,763 |  |  |  |  |  | 288,763 |  |  |  |  |  |  | 288,763 |  |  |
Foreign currency translation adjustments |  | (8,759) |  |  |  |  |  |  |  |  | ¥ (8,759) |  |  |  | (8,759) |  |  |
Balances at Dec. 31, 2017 |  | (1,641,768) |  |  |  |  | ¥ 1 | 289,674 |  |  | (8,759) |  | (1,922,748) |  | (1,641,832) |  | 64 |
Balances (in shares) at Dec. 31, 2017 | shares |  |  |  |  |  |  | 4,329,000 |  |  |  |  |  |  |  |  |  |  |
Net loss for the year |  | (926,950) |  |  |  |  |  |  |  |  |  |  | (927,022) |  | (927,022) |  | 72 |
Issuance of ordinary shares, net of issuance cost of 80,128 |  | 1,109,517 |  |  |  |  |  | 1,109,517 |  |  |  |  |  |  | 1,109,517 |  |  |
Issuance of ordinary shares, net of issuance cost, shares | shares |  |  |  | 659,131 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible redeemable preferred shares upon initial public offering (Note 13) |  | 1,024,709 |  | ¥ 1 |  | ¥ 1 | ¥ (1) | 1,024,708 |  |  |  |  |  |  | 1,024,709 |  |  |
Conversion of convertible redeemable preferred shares upon initial public offering (Note 13), shares | shares |  |  |  | 1,159,252 | 826,389 | 4,265,286 | (4,329,000) |  |  |  |  |  |  |  |  |  |  |
Share repurchase |  | (34,828) |  |  |  |  |  | (34,828) |  |  |  |  |  |  | (34,828) |  |  |
Share repurchase, shares | shares |  |  |  | (45,082) |  |  |  |  |  | 45,082 |  |  |  |  |  |  |  |
Share-based compensation |  | 2,751 |  |  |  |  |  | 2,751 |  |  |  |  |  |  | 2,751 |  |  |
Foreign currency translation adjustments |  | 127,586 |  |  |  |  |  |  |  |  | 127,586 |  |  |  | 127,586 |  |  |
Balances at Dec. 31, 2018 |  | (338,983) |  | ¥ 1 |  | ¥ 1 |  | 2,391,822 |  |  | 118,827 |  | (2,849,770) |  | (339,119) |  | 136 |
Balances (in shares) at Dec. 31, 2018 | shares |  |  |  | 1,773,301 | 826,389 | 4,265,286 |  |  |  | 45,082 |  |  |  |  |  |  |  |
Net loss for the year |  | (395,165) | $ (56,763) |  |  |  |  |  |  |  |  |  | (394,817) |  | (394,817) |  | (348) |
Conversion Class C Ordinary shares to Class A Ordinary shares (Note 13), shares | shares |  |  |  | 6,600 |  | (6,600) |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase |  | (30,793) |  |  |  |  |  | (30,793) |  |  |  |  |  |  | (30,793) |  |  |
Share repurchase, shares | shares |  |  |  | (51,895) |  |  |  |  |  | 51,895 |  |  |  |  |  |  |  |
Share-based compensation |  | 2,970 |  |  |  |  |  | 2,970 |  |  |  |  |  |  | 2,970 |  |  |
Foreign currency translation adjustments |  | 23,608 | 3,391 |  |  |  |  |  |  |  | 23,608 |  |  |  | 23,608 |  |  |
Balances at Dec. 31, 2019 |  | ¥ (738,363) | $ (106,059) | ¥ 1 |  | ¥ 1 |  | ¥ 2,363,999 | $ 339,567 |  | ¥ 142,435 | $ 20,460 | ¥ (3,244,587) | $ (466,056) | ¥ (738,151) | $ (106,029) | ¥ (212) | $ (30)
Balances (in shares) at Dec. 31, 2019 | shares |  |  |  | 1,728,006 | 826,389 | 4,258,686 |  |  |  | 96,977 |  |  |  |  |  |  |  |
[1] | In July 2017, Beijing Shangde Online Education Technology Co., Ltd. (“Beijing Sunlands”) repurchased equity interests held by certain shareholders at a total cash consideration of RMB71,303. Such equity interests of Beijing Sunlands were originally acquired at a cost of RMB30,000.

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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